Hello,Can you check my answers please? Especially these which have commas..Combine the following Sentences to have only one independent clause:-

Ann has been writing letters the whole day. She didn't go out.

Ann, who has been writing letters the whole day, didn't go out.

Can I also solve this this way?Remember the question is about to combine the sentences that include only one independent clause.

We'll make our decision. We'll let you know.We, who will make our decision, will let you know.

My brother is an actor. He has appeared in several films.(1) My brother is an actor who has appeared in several films.(2) My brother, an actor, has appeared in several films.(3) My brother, who is an actor, has appeared in several films.

Can these three possible answers be correct?

Bill and Andy make films. They started making films together when they left college.(1) Bill and Andy, who make films, started making films together when they left college.(2) Bill and Andy make films which were started to be made by them when they left college.